大佬们，这个设计规范怎么加呀，一直错误，可以帮帮我吗

我想通过调节流股11的温度使换热器HX1和HX2热负荷绝对值相等，别的流程没问题，但是设计规范收敛不了
The following Convergence blocks were
completed with errors:
$OLVER03

The following messages were issued during Input Translation:

*  WARNING WHILE CHECKING INPUT SPECIFICATIONS FOR VARIED VARIABLE IN
   DESIGN-SPEC: 'DS-1'
   YOU ARE VARYING A VARIABLE OF AN INTERMEDIATE STREAM
   STREAM RESULTS MAY BE INCONSISTENT WITH THE BLOCK UPSTREAM

*  WARNING WHILE CHECKING INPUT SPECIFICATIONS
   INCONSISTENT FREE WATER SETTING DETECTED FOR 2 STREAMS
   SOURCE BLOCK        FREE WATER STREAM   DESTINATION BLOCK   FREE WATER
   =================== ========== ======== =================== ==========
   B8                  YES        31       ABSORBER            NO
   B7                  NO         18       B8                  YES